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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90869d26d2a9d2a29143e65877fe9b45822296a1eb5134b63ae50b8b3e9102b4' 
  AND token = '+XFH4LcAwu52WIzJaBI065RjotoRX2pEx7CWuecMkzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}